Fig. 4
Contour plot of the afterglow of GRB 071028B obtained by fitting models to its optical and near-infrared spectral energy distribution using HyperZ. The figure shows the 68%, 90%, and 99% confidence levels of the spectral index 
versus the intrinsic extinction 
, which are based on a single power law in combination with the dust model of a starburst (SB).
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